Starting device for sewing-machines.



0.5.I0HNS0N- STARTING DEVICE FOR SEWING MACHINES.

APPLICATION FILED APR. 20, I9I5.

Il I 96,461 l Patented Aug. 29, 1916.

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Q.E.JOHN5ON FN @FTF ll OSKAR E. JOHNSON, OF ALTA, IOWA.

STARTING DEVICE FOR SEWING-MACHINES.

applicati@ ined April 2o, 191e.

To all whom 'it may concern.'

Be it known that I, OsKAR E. JOHNSON, a citizen of the United States, residing at Alta, in the county of Buena Vista and State of Iowa, have invented certain new and useful Tmprovements in Starting Devices for Sewing-Machines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to a starting device for sewing machines and has for its primary object to provide a very simple and reliable mechanism for starting the operation of the fly wheel shaft of a sewing machine after which its subsequent operation may be continued through the medium of the ordinary treadle plate.

It is another and more particular object of the invention to provide a device of the above character embodying a standard mounted upon the fly wheel shaft for rocking movement, means adjustably mounted upon said standard for frictional engagement with the periphery of the fly wheel, and manually operable means for actuating said standard to give a starting impulse to the fly wheel.

Tt is a further object of the invention to provide a device for the above purpose which is simple in construction, positive and reliable in its action and may be readily applied to the ordinary type of sewing machine now in general use.

Vith the above and other objects in view, my invention consists in the novel features of construction, combination and arrange ment of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawing, in which,

Figure 1 is a front elevation showing the preferred. embodiment of my invention applied to a sewing machine: Fig. 2 is a section taken on the line 2-2 of Fig. 1: Fig. 3 is a section taken on the line 3 3 of Fig. 2.

Referring in detail to the drawing, 5 designates a sewing machine, the mechanism of which is actuated through the medium of an endless drive belt o-r thong 6 which traverses the fly wheel 7 journaled upon the stub shaft or arbor 8 suitably mounted in the machine frame 9.

10 designates the usual treadle plate which is eccentrically connected to the fly wheel 7 by means of the pitman rod 11.

Upon the arbor 8 between the fly wheel 7 and the frame 9, the lower end of a standard Specification of Letters Patent.

Patented Aug. 29, 1918..

serial No. 92,495.

12 is loosely mounted for rocking moves ment. The upper end of this stand-ard is provided with a longitudinal slot 13 to receive a bolt 11 loosely engaged at one of its ends in'a cam member 15. A clamping nut 16 is threaded upon the other end of this bolt, whereby the cam member may be securely held in its adjusted position upon the standard. This cam member is provided witha friction surface for engagement upon the periphery of the fly wheel 7.

To the frame 9, the spaced guides 17 are secured, and each of said guides being preferably formed in -two sections, as clearly shown in Fig. 3, and detachably clamped to the frame. Through the corresponding sections of the guides 17, an arcuate-shaped bar 18 is freely movable, said bar being substantially concentric to the fly wheel 7. This bar 18 is formed with an outwardly projecting end portion 19 which projects toward the operator. A clamping plate 2O has an offset end' securely fixed to one side of the bar 18 and theother end of the clamping bar is engaged upon a bolt 21 fixed in the movable bar 18. The standard 12 projects upwardly between the bar 18 and the clamping bar 20, and a nut 22 is threaded upon the bolt 21 and is adapted to exert pressure against the free end of the clamping bar and force the same into tight clamping engagement upon the standard.

Upon the machine 5, a guide sheave or pulley 23 is suitably mounted, and over the same the cable 2-1 is engaged, one end of said cable being connected to the end portion 19 of the bar 18. The other end of this cable is connected to an angularly disposed plate 25 which is pivotally mounted at one of its ends in a clamp 26 attached to the frame 9. A coil spring 27 is also secured at one of its ends to the end 19 of the bar 18 and connected at its other end to the clamp 28 attached to the machine frame.

It will be apparent from the above description, that when the depending end of the plate 25 is engaged by the knee and forced outwardly in a lateral direction, the cable 24: is pulled and the bar 18 forced rearwardly through the guide 17. As the standard 12 is clamped to this bar, said standard will be rocked upon the arbor 8 and the cam 15 frictionally engaging upon the periphery of the fly wheel will rotate said fly wheel in the proper direction. When pressure upon the plate 25 is released, the spring 27, by its contractile action, returns the bar 18 to its normal position, the cam l5 sliding freely upon the periphery of the fly Wheel and 0ffering no resistance to the rotation thereof. By repeating this operation several times, a suilicient starting impulse is given to the fly Wheel so that its operation can then be continued by means of the treadle plate 10. The return movement of the standard 12 in the cam 15 is limited by the engagement of said standard with the stop linger 29 which is suitably clamped to the side of the machine frame 9.

From the foregoing description, taken in connection With the accompanying drawing, the construction, manner of operation and several advantages of the invention Will be clearly and fully understood. The device may be operated with a minimum of manual labor and is very serviceable and convenient for the purpose in view. The device can alsok be very readily applied to the ordinary sewing machine now in general use Without necessitating any alterations in the construction thereof.

While I have shown and described the preferred form and arrangement of the several elements employed, it is tobe understood that the same are susceptible of con siderable modification and I, therefore, reserve the privilege of adopting all such legitimate changes as may be fairly embodied Within the spirit and scope of the in'- vention as claimed.

Having thus fully described my invention, what I desire to claim and secure by Letters Patent is l. In a starting device for sewing machines, the combination of a fly Wheel and shaft, of an oscillatable standard mounted on the fly Wheel shaft, means adjustably mounted upon the upper end of the standard to frictionally engage upon the periphery of the fly Wheel, a slidably mounted bar concentrically disposed with respect to the fly Wheel, means for clamping the standard to said bar, and manually operable means to actuate said slide bar and oscillate the standard to impart a rotative movement in one direction to the fly Wheel.

2. In a starting device for sewing machines, the combination of a ily Wheel and shaft, of an oscillatable standard mounted on the fly Wheel shaft, means adj ustably mounted upon the upper end of the standard to frictionally engage upon the periphery of the fiy Wheel, a spring-held, slidably mounted bar disposed in concentric relation to the fly Wheel, means for clamping the standard upon one side of said bar, a cable connected to one end of the bar, and a manually operable element to which the other end of the cable is connected and whereby said bar may be actuated against the action of the holding spring to oscillate the standard and impart a rotative movement to the fly Wheel in one direction.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

OSKAR E. JOHNSON.

` Witnesses:

A. R. BEOWNE, HELEN M. ANDERSON.

Copies of this patent may be obtained for nve cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

